SetZoom
void SetZoom(float zoom);
SetZoom(1.0f);
SetZoom(zoom, where);
SetZoom(zoom, where);
SetZoom(1.0f);
SetZoom(fitToBoundsZoom);
void SetZoom(float zoom,
fStatusView->SetZoom(fImageView->Zoom());
fImageView->SetZoom(1.0);
void SetZoom(int32 tab, bool pressed);
decorator->SetZoom(fTab, false);
decorator->SetZoom(fTab, hitRegion == fButton);